This problem has questions about UCSC ID numbers. UCSC ID numbersall have 7 digits from 0 to 9. We will assume that all digits can be 0 through 9. Becareful! There are subtleties lurking here. a. How many UCSC ID numbers have digits that sum to 9?
b. How many UCSC ID numbers have digits that sum to 17?
c. What size class must have at least 3 students whose UCSC ID numbers sum to the same number?
d. What is the probability that a randomly selected UCSC ID sums to more than 17?

First locate the turning point (vertex) of the graph. which is at the coordinates x=5 and y=9 or (5; 9).to determine whether it's a maximum or mininum value, you have to discern whether the vertex's y-value is the highest value or lowest value the graph can reach. since the vertex's y-value, 9 is the highest value the graph can reach, it will be a maximum.another basic way to determine whether the vertex's value is max or min is to see if the graph is smiling or sad. if it's smiling, the turning point/vertex would be a minimum, while a sad parabola would have a maximum y-value at the vertex.